BLF means Busy Lamp Field. Generally, this is an LED that shows the status of an extension or line, an application, or even the presence of a user.
Sometimes, this LED is physically embedded into a key that when pressed, can enable or disable an application, and depending on these states, the LED can be turned off or on.
In most of the cases, the BLF points to an extension. For example, an assistant can notice if the boss is busy (LED on) or free to be called (LED off). All IP phones support BLF in most cases.
Go to the PBX | Tools | Asterisk File Editor menu.
Edit the
extensions_custom.conf
file.Look for the section (properly named
context
)[from-internal-custom]
and add the following line at the end of this context:include=>call-forward
. This is shown in the next image:Then, at the end of the file, we add the portion of the Dialplan from Asterisk that executes the Call Forward toggle button, as shown in the next screenshot:
Press the Save button and...